CN111458662A - Wireless communication transformer winding deformation frequency response method detection and operation system and method - Google Patents
Wireless communication transformer winding deformation frequency response method detection and operation system and method Download PDFInfo
- Publication number
- CN111458662A CN111458662A CN202010236222.9A CN202010236222A CN111458662A CN 111458662 A CN111458662 A CN 111458662A CN 202010236222 A CN202010236222 A CN 202010236222A CN 111458662 A CN111458662 A CN 111458662A
- Authority
- CN
- China
- Prior art keywords
- frequency
- sweep
- signal
- upper computer
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 115
- 238000001514 detection method Methods 0.000 title claims abstract description 109
- 238000004804 winding Methods 0.000 title claims abstract description 57
- 238000004891 communication Methods 0.000 title claims abstract description 56
- 230000004044 response Effects 0.000 title claims abstract description 17
- 238000004364 calculation method Methods 0.000 claims abstract description 60
- 238000012545 processing Methods 0.000 claims abstract description 21
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 238000010408 sweeping Methods 0.000 claims description 98
- 230000008569 process Effects 0.000 claims description 55
- 238000001914 filtration Methods 0.000 claims description 53
- 238000007781 pre-processing Methods 0.000 claims description 13
- 238000004886 process control Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 5
- 230000003993 interaction Effects 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dc Digital Transmission (AREA)
Abstract
The invention discloses a system and a method for detecting and operating a transformer winding deformation frequency response method through wireless communication, wherein the system comprises: an upper computer control unit and a lower computer detection unit; the upper computer control unit comprises an upper computer instruction module and an upper computer wireless communication module; the lower computer detection unit comprises a lower computer wireless communication module, a sweep frequency signal generation module, a signal processing module and a signal calculation module; the upper computer instruction module is converted into an upper computer instruction according to the user requirement; sending the upper computer instruction to a lower computer detection unit in a wireless communication mode; the lower computer detection unit is connected with the transformer winding load to be detected, has a detection operation function, collects and calculates a load output signal, and uploads the load output signal to the upper computer for detection and analysis; the system and the method avoid long-distance wiring, and avoid the problems of low detection accuracy and consistency and low detection efficiency in the prior art.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a system and a method for detecting and operating a transformer winding deformation frequency response method through wireless communication.
Background
The power transformer is a key core device of the power system, the device loading amount in the power grid system is large, and the operation reliability of the power transformer is directly related to the power supply safety of the power system. However, in recent years, the deformation fault of the transformer winding is frequent and is positioned at the first position of the transformer fault, and according to incomplete statistics, the deformation fault of the transformer winding accounts for 33.8% of all the faults of the transformer. Frequent transformer winding deformation fault has led to the worry of very big equipment reliability, especially along with electric power system scale is bigger and bigger, and the capacity is higher and higher, and system short circuit current level promotes year by year, and transformer winding deformation fault hidden danger is more outstanding, and behind the system short circuit, how to detect out the transformer fast effectively and whether take place the winding and warp, avoid transformer fault damage, have become the problem of the key concern of operation and maintenance unit, need to solve urgently.
The frequency response method is the most effective technical means for detecting the winding deformation, and has good application effect in the aspect of offline detection of the transformer winding deformation. However, the existing application of the frequency response method has the following problems:
(1) the detection accuracy and consistency are low. In the prior art, the distance between a signal generation and collection point and a tested transformer test point is too large, usually 10-20 m, and the signal generation and collection point and the tested transformer test point are connected through a long coaxial line, and a coaxial line shielding layer is connected with a grounding point through a long-distance grounding line. Due to the fact that the high-frequency signals are greatly influenced by space coupling interference when the high-frequency signals are transmitted in the long-distance transmission line, measured high-frequency signals are seriously attenuated and distorted, and accuracy of calculation results is influenced. Meanwhile, the field wiring environment is complex, the trend and the position of a signal connection line are difficult to ensure to be completely consistent for each detection of the same test sample, and the effect of stray parameters on detection results is different in each test, so that the test consistency is low.
(2) The detection efficiency is low. In the prior art, a large amount of long-distance cables and power supply systems are required during detection, the system structure is complex, the wiring and the disconnecting are time-consuming in the detection process, and the detection efficiency is seriously reduced.
(3) The detection range is difficult to expand. In the existing detection technology, an algorithm is centralized on an upper computer, a detection circuit is centralized on a lower computer, the algorithm is separated from the detection circuit, and original detection data must be completely uploaded to the upper computer to carry out unified operation. This mode results in too high redundancy of the detection data and difficult extension of the single-machine detection range.
Disclosure of Invention
In order to solve the problems of complex wiring, low detection accuracy and consistency, low detection efficiency and the like of the existing detection method and device in field application in the background art, the invention provides a system and a method for detecting and operating a wireless communication transformer winding deformation frequency response method, wherein the system and the method realize interaction between a field detection device and an upper computer control unit through a wireless network, and sink detection operation into a hardware detection circuit to realize signal acquisition, data processing and calculation on the field, and the system for detecting and operating the wireless communication transformer winding deformation frequency response method comprises the following steps:
an upper computer control unit and a lower computer detection unit; the upper computer control unit comprises an upper computer instruction module and an upper computer wireless communication module; the lower computer detection unit comprises a lower computer wireless communication module, a sweep frequency signal generation module, a signal processing module and a signal calculation module;
the upper computer instruction module is used for receiving control requirement information of a user and converting the control requirement information into a preset upper computer instruction; the upper computer instruction unit is connected with the upper computer wireless communication module; the upper computer instruction module sends the upper computer instruction to a lower computer detection unit through the upper computer wireless communication module; the upper computer instruction comprises frequency sweeping signal information;
the upper computer wireless communication module and the lower computer wireless communication module are used for establishing communication channels for data transmission through a preset wireless communication protocol;
the output end of the sweep frequency signal generating module is connected with the input end of the winding load of the transformer to be detected; the input end of the signal processing module is connected with the output end of the winding load of the transformer to be detected;
the frequency sweep signal generation module obtains frequency sweep signal information in an upper computer instruction through the lower computer wireless communication module, generates a frequency sweep signal according to the frequency sweep signal information and outputs the frequency sweep signal to the transformer winding load;
the signal processing module is provided with two input ends which are respectively connected with two output ends of the winding load of the transformer to be detected;
the signal processing module is used for preprocessing the two paths of output signals of the transformer winding load to be detected according to a preset rule and transmitting the two paths of output signals after preprocessing to the input end of the signal calculation module;
the signal calculation module is used for calculating to obtain detection parameters according to the two paths of input signals and a preset rule and uploading the detection parameters to the upper computer control unit through the lower computer wireless communication module;
and the upper computer control unit is used for analyzing the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result.
Further, the sweep signal information includes sweep signal information including signal peak, sweep start frequency, sweep cut-off frequency, sweep mode and sweep point number;
the signal peak value, the frequency sweep starting frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control requirement information determined by a user in a corresponding preset parameter interval.
Further, the frequency sweeping modes comprise a linear frequency sweeping mode and a logarithmic frequency sweeping mode;
the upper computer instruction module is used for determining a frequency array according to the frequency sweep starting frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the frequency sweep point number;
the frequency sweep signal generation module sequentially generates frequency sweep signals according to the frequency values in the frequency array;
when the frequency sweeping mode is a linear frequency sweeping mode, the calculation mode of the frequency array is as follows:
when the frequency sweeping mode is a logarithmic frequency sweeping mode, the calculation mode of the frequency array is as follows:
wherein f is2For frequency sweep cut-off frequency, f1For the frequency sweep starting frequency, N is the number of frequency sweep points, i is the frequency sweep number, and i is 0,1,2 … N-1.
Further, the signal processing module comprises a band-pass filtering submodule and an AD acquisition submodule;
the band-pass filtering submodule is used for filtering the two paths of output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain two paths of filtered output signals;
and the AD acquisition submodule is used for carrying out AD conversion on the filtered output signals to obtain two paths of digital output signals.
Further, the upper computer instruction comprises filtering control information; the band-pass filtering submodule is used for determining whether to carry out band-pass filtering according to the filtering control information; and if the band-pass filtering is determined not to be carried out, transmitting the two original output signals to an AD acquisition submodule.
Furthermore, the signal processing module also comprises a range adjusting submodule;
the range adjusting submodule is used for judging whether the acquisition range of the search output signal needs to be adjusted according to a preset judging method;
the preset judgment method comprises the steps of comparing a signal peak value of a current acquisition output signal with a current range, and if the signal peak value is within a preset proportion range of the current range, the range adjustment is not needed; if the signal peak value is higher than the preset proportional range of the current range, the range is adjusted upwards according to a preset proportion; and if the signal peak value is lower than the preset proportional range of the current range, adjusting the range downwards according to a preset proportion.
Further, the signal calculation module calculates the detection parameters including an amplitude-frequency parameter and a phase-frequency parameter;
the calculation formula of the amplitude-frequency parameter H is as follows:
H＝20lg(V2/V1)
the calculation formula of the phase frequency parameter C is as follows:
C＝θ2-θ1
wherein H is an amplitude-frequency parameter; v1Collecting a peak value of a waveform for a first channel; v2Collecting a peak value of a waveform for the second channel; c is a phase frequency parameter; theta1Collecting an initial phase of a waveform for a first channel; theta2And acquiring the initial phase of the waveform for the second channel.
Further, the lower computer detection unit further comprises a storage module and a process control module;
the storage module is used for performing associated storage on the detection parameters obtained by the calculation of the signal calculation module and the current frequency;
the process control module is used for judging whether the frequency sweeping process is finished or not according to the current frequency and the frequency sweeping cut-off frequency; when the frequency sweeping process is judged to be finished, uploading a plurality of groups of detection parameters stored in the storage module to an upper computer control unit;
the process control module is used for generating a process instruction after each group of detection parameters are obtained through calculation; when the frequency sweeping process is not finished, the process instruction comprises a current frequency value; when the frequency sweeping process is finished, the process instruction is a preset process instruction representing the end of frequency sweeping;
and the upper computer control unit receives a plurality of groups of inspection parameters after receiving a progress instruction representing the end of frequency sweeping.
The wireless communication transformer winding deformation frequency response method detection and operation method comprises the following steps:
receiving control requirement information of a user and generating an upper computer instruction; the upper computer instruction comprises frequency sweeping signal information;
transmitting the upper computer instruction to a lower computer detection unit by a wireless communication method; generating a frequency sweeping signal according to the frequency sweeping signal information of the upper computer instruction and outputting the frequency sweeping signal to the transformer winding load;
collecting two paths of output signals of the transformer winding load to be detected, and preprocessing the two paths of output signals to obtain two paths of preprocessed output signals;
calculating according to the two preprocessed output signals and calculating according to a preset rule to obtain detection parameters;
uploading the detection parameters to an upper computer control unit through a wireless communication method; and analyzing the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result.
Further, the sweep signal information includes sweep signal information including signal peak, sweep start frequency, sweep cut-off frequency, sweep mode and sweep point number;
the signal peak value, the frequency sweep starting frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control requirement information determined by a user in a corresponding preset parameter interval.
Further, determining a frequency array according to the frequency sweep starting frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the frequency sweep point number; the frequency sweeping modes comprise a linear frequency sweeping mode and a logarithmic frequency sweeping mode;
generating frequency sweeping signals in sequence according to the frequency values in the frequency array;
when the frequency sweeping mode is a linear frequency sweeping mode, the calculation mode of the frequency array is as follows:
when the frequency sweeping mode is a logarithmic frequency sweeping mode, the calculation mode of the frequency array is as follows:
wherein f is2For frequency sweep cut-off frequency, f1For the frequency sweep starting frequency, N is the number of frequency sweep points, i is the frequency sweep number, and i is 0,1,2 … N-1.
Further, preprocessing the two output signals to obtain two preprocessed output signals, including:
the band-pass filtering submodule is used for filtering the two paths of output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain two paths of filtered output signals;
and the AD acquisition submodule is used for carrying out AD conversion on the filtered output signals to obtain two paths of digital output signals.
Further, the preprocessing the two output signals further includes:
the upper computer instruction comprises filtering control information;
determining whether to carry out band-pass filtering according to the filtering control information; and if the band-pass filtering is determined not to be carried out, replacing the two filtered output signals with the original two output signals.
Further, judging whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method;
the preset judgment method comprises the steps of comparing a signal peak value of a current acquisition output signal with a current range, and if the signal peak value is within a preset proportion range of the current range, the range adjustment is not needed; if the signal peak value is higher than the preset proportional range of the current range, the range is adjusted upwards according to a preset proportion; and if the signal peak value is lower than the preset proportional range of the current range, adjusting the range downwards according to a preset proportion.
Further, the detection parameters comprise amplitude-frequency parameters and phase-frequency parameters;
the calculation formula of the amplitude-frequency parameter H is as follows:
H＝20lg(V2/V1)
the calculation formula of the phase frequency parameter C is as follows:
C＝θ2-θ1
wherein H is an amplitude-frequency parameter; v1Collecting a peak value of a waveform for a first channel; v2Collecting a peak value of a waveform for the second channel; c is a phase frequency parameter; theta1Collecting an initial phase of a waveform for a first channel; theta2And acquiring the initial phase of the waveform for the second channel.
Further, the detection parameters calculated by the signal calculation module and the current frequency are stored in an associated manner;
judging whether the frequency sweeping process is finished or not according to the current frequency and the frequency sweeping cut-off frequency; when the frequency sweeping process is judged to be finished, uploading a plurality of groups of detection parameters stored in the storage module to an upper computer control unit;
generating a process instruction after each group of detection parameters are obtained through calculation; when the frequency sweeping process is not finished, the process instruction comprises a current frequency value; and when the frequency sweeping process is finished, the process instruction is a preset process instruction representing the end of frequency sweeping.
The invention has the beneficial effects that: the technical scheme of the invention provides a wireless communication transformer winding deformation frequency response method detection operation system and a wireless communication transformer winding deformation frequency response method detection operation method, wherein the system and the method realize the interaction between an on-site detection device and an upper computer control unit through a wireless network, and sink the detection operation into a hardware detection circuit, so that the signal acquisition, the data processing and the calculation are realized on site; the system and the method avoid long-distance wiring, avoid the problems of low detection accuracy and consistency and low detection efficiency in the prior art, and simultaneously can establish an edge calculation network formed by an upper computer and a plurality of lower computers, thereby greatly expanding the detection range.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a structural diagram of a transformer winding deformation frequency response detection and calculation system for wireless communication according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for detecting and calculating a deformation frequency response of a transformer winding in wireless communication according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a structural diagram of a transformer winding deformation frequency response detection and calculation system for wireless communication according to an embodiment of the present invention; as shown in fig. 1, the system includes:
an upper computer control unit 110 and a lower computer detection unit 120; the upper computer control unit 110 comprises an upper computer instruction module 111 and an upper computer wireless communication module 112; the lower computer detection unit 120 includes a lower computer wireless communication module 121, a frequency sweep signal generation module 122, a signal processing module 123, and a signal calculation module 124;
in order to avoid the problem of signal attenuation distortion caused by overlarge wired transmission distance of signals, the accuracy of the signals is ensured in a wireless communication mode of an upper computer and a lower computer; in this embodiment, the lower computer detection unit 120 is connected to the transformer winding load to be detected, and the upper computer is used to realize information interaction in a wireless communication manner, so that the problem of detection accuracy in the prior art is solved.
The upper computer instruction module 111 is used for receiving control requirement information of a user and converting the control requirement information into a preset upper computer instruction; the upper computer instruction unit is connected with the upper computer wireless communication module 112; the upper computer instruction module 111 sends the upper computer instruction to the lower computer detection unit 120 through the upper computer wireless communication module 112; the upper computer instruction comprises frequency sweeping signal information;
in this embodiment, the sweep signal information includes sweep signal information including a signal peak, a sweep start frequency, a sweep cut-off frequency, a sweep mode, and a sweep point number;
the upper computer instruction further comprises filtering control information;
the instruction format may be:
VPP＝XX,BP＝T(F),F1＝XXXX.X,F2＝XXXX.X,N＝XXXX,SM＝LIN(LOG )
wherein:
1) VPP is the peak-to-peak value of the output sinusoidal signal, the unit is V, 05V-20V is adjustable, and the precision is as follows: 1V;
2) f1 is the starting frequency, unit: the kHz is adjustable, and the frequency is 0.1 kHz-2000 kHz;
3) f2 is the cutoff frequency, unit: the kHz is adjustable, and the frequency is 0.1 kHz-2000 kHz;
4) n is the number of frequency sweeping points in unit: and (4) respectively.
5) The SM is a frequency sweep method, which includes a linear frequency sweep method and a logarithmic frequency sweep method, where SM is L IN for a linear frequency sweep, and SM is L OG for a logarithmic frequency sweep.
6) The BP is a band-pass filtering function, the band-pass filtering is started if the BP is T, the band-pass filtering is closed if the BP is F, and the default is closed;
the signal peak value, the frequency sweep starting frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control requirement information determined by a user in a corresponding preset parameter interval, namely, the user can only input parameters in the preset interval to generate an upper computer instruction.
The upper computer instruction module 111 is used for determining a frequency array according to the frequency sweep starting frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the frequency sweep point number;
the frequency sweep signal generation module 122 sequentially generates frequency sweep signals according to the frequency values in the frequency array;
when the frequency sweeping mode is a linear frequency sweeping mode, the calculation mode of the frequency array is as follows:
when the frequency sweeping mode is a logarithmic frequency sweeping mode, the calculation mode of the frequency array is as follows:
wherein f is2For frequency sweep cut-off frequency, f1For the frequency sweep starting frequency, N is the number of frequency sweep points, i is the frequency sweep number, and i is 0,1,2 … N-1.
For example: f. of1＝1,f210, N is 10, and the linear sweep array is: (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) kHz; the logarithmic sweep array is: (1,1.3,1.7,2.2,2.8，3.6，4.6，6.0， 7.7，10.0)kHz。
the upper computer wireless communication module 112 and the lower computer wireless communication module 121 are used for establishing a communication channel for data transmission through a preset wireless communication protocol;
the output end of the sweep frequency signal generating module 122 is connected with the input end of the winding load of the transformer to be detected; the input end of the signal processing module 123 is connected with the output end of the transformer winding load to be detected;
the frequency sweep signal generation module 122 obtains frequency sweep signal information in an upper computer instruction through the lower computer wireless communication module 121, generates a frequency sweep signal according to the frequency sweep signal information, and outputs the frequency sweep signal to the transformer winding load;
in this embodiment, the sweep frequency signal generating module 122 is configured to generate a sinusoidal sweep frequency signal frequency-by-frequency according to the frequency array, and send the signal to enter a load network. The parameters of the sinusoidal signal are: the frequency range is 100Hz-2 MHz; the sweep frequency step length is 500Hz, and the precision of each frequency point is not more than 0.01 percent; peak-to-peak airborne voltage: 1-20 Vpp is adjustable, the step size is 1Vpp, and the absolute error between the voltage peak-to-peak value of each frequency point and the preset value is not more than 1% of the preset voltage peak-to-peak value; the output impedance is 50 omega.
The signal processing module 123 has two input ends, which are respectively connected with two output ends of the transformer winding load to be detected;
the signal processing module 123 is configured to pre-process the two output signals of the transformer winding load to be detected according to a preset rule, and transmit the two pre-processed output signals to the input end of the signal calculation module;
in this embodiment, the signal processing module 123 includes a band-pass filtering sub-module 1231 and an AD collecting sub-module 1232;
the band-pass filtering submodule 1231 is configured to filter the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands, so as to obtain two filtered output signals;
the AD acquisition submodule 1232 is configured to perform AD conversion on the filtered output signal to obtain two paths of digital output signals.
In this embodiment, the main parameters of the AD acquisition sub-module 1232 may be:
1) the sampling rates are automatically adjusted to be 1MS/s and 20 MS/s.
2) Resolution ratio: 12 bit.
3) Sampling storage depth: 1 kHz-2 MHz sine signals are sampled for 4 periods once.
4) The triggering mode is as follows: and (4) no trigger exists, and automatic acquisition is carried out after an instruction is received.
5) Coupling mode: and (6) AC.
Further, the upper computer instruction comprises filtering control information; the band-pass filtering submodule 1231 is configured to determine whether to perform band-pass filtering according to the filtering control information; and if the band-pass filtering is determined not to be performed, transmitting the two original output signals to an AD acquisition submodule 1232.
As shown in the above example, BP is a band-pass filtering function, and if BP is equal to T, band-pass filtering is turned on, and if BP is equal to F, band-pass filtering is turned off, and the default is off;
further, the signal processing module 123 further includes a range adjustment sub-module 1233;
the range adjusting submodule 1233 is configured to determine whether an acquisition range of the search output signal needs to be adjusted according to a preset determination method;
the preset judgment method comprises the steps of comparing a signal peak value of a current acquisition output signal with a current range, and if the signal peak value is within a preset proportion range of the current range, the range adjustment is not needed; if the signal peak value is higher than the preset proportional range of the current range, the range is adjusted upwards according to a preset proportion; and if the signal peak value is lower than the preset proportional range of the current range, adjusting the range downwards according to a preset proportion.
The signal calculation module 124 is configured to calculate and obtain detection parameters according to the two input signals and a preset rule, and upload the detection parameters to the upper computer control unit 110 through the lower computer wireless communication module 121;
the signal calculation module 124 calculates the detection parameters including amplitude-frequency parameters and phase-frequency parameters;
the calculation formula of the amplitude-frequency parameter H is as follows:
H＝20lg(V2/V1)
the calculation formula of the phase frequency parameter C is as follows:
C＝θ2-θ1
wherein H is an amplitude-frequency parameter; v1Collecting a peak value of a waveform for a first channel; v2Collecting a peak value of a waveform for the second channel; c is a phase frequency parameter; theta1Collecting an initial phase of a waveform for a first channel; theta2And acquiring the initial phase of the waveform for the second channel.
The upper computer control unit 110 is configured to analyze the detection parameters according to a preset analysis method, so as to obtain a detection result of the deformation of the transformer winding.
Further, the lower computer detection unit 120 further includes a storage module 125 and a process control module 126;
the storage module 125 is configured to perform associated storage on the detection parameter calculated by the signal calculation module 124 and the current frequency;
the process control module 126 is configured to determine whether the frequency sweeping process is finished according to the current frequency and the frequency sweeping cut-off frequency; when the frequency sweeping process is judged to be finished, the plurality of groups of detection parameters stored in the storage module 125 are uploaded to the upper computer control unit 110;
the process control module 126 is configured to generate a process instruction after each group of detection parameters is obtained through calculation; when the frequency sweeping process is not finished, the process instruction comprises a current frequency value; when the frequency sweeping process is finished, the process instruction is a preset process instruction representing the end of frequency sweeping;
in this embodiment, the process instructions may be three types:
1) none. Normal execution flow of lower computer
2) STOP ═ F. Uploading the current frequency by the lower computer in the format of F (XXXX)
3) STOP ═ T. When the frequency sweeping process is finished, the lower computer enters a sleep mode;
in this example. After determining that the cutoff frequency is reached, the upper computer control unit 110 receives a progress instruction representing the end of the frequency sweep, and then receives a plurality of sets of inspection parameters. Specifically, the method comprises the following steps:
and uploading each frequency point H, C stored in the memory to the upper computer, and emptying the memory after uploading is finished. The uploading instruction is as follows: the format of data uploaded by a lower computer is H1, H2 and H3 … … Hn; c1, C2, C3 … … Cn; t (F) (H1, H2 and H3 … … Hn are amplitude frequency calculation results of each frequency point, C1, C2 and C3 … … Cn are phase frequency calculation results of each frequency point, T (F) is a check code, if signals of each frequency point do not exceed the maximum range, the check code is T, and if some signals of the frequency points exceed the maximum range, the check code is F). If the frequency sweeping process is not finished, executing the generation, acquisition, calculation and storage operations of the next frequency point signal, and if an upper computer gives: READ BUFFER, then return null data.
Fig. 2 is a flowchart of a method for detecting and calculating a deformation frequency response of a transformer winding in wireless communication according to an embodiment of the present invention. As shown in fig. 2, the method includes:
further, the sweep signal information includes sweep signal information including signal peak, sweep start frequency, sweep cut-off frequency, sweep mode and sweep point number;
the signal peak value, the frequency sweep starting frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control requirement information determined by a user in a corresponding preset parameter interval.
Further, determining a frequency array according to the frequency sweep starting frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the frequency sweep point number; the frequency sweeping modes comprise a linear frequency sweeping mode and a logarithmic frequency sweeping mode;
generating frequency sweeping signals in sequence according to the frequency values in the frequency array;
when the frequency sweeping mode is a linear frequency sweeping mode, the calculation mode of the frequency array is as follows:
when the frequency sweeping mode is a logarithmic frequency sweeping mode, the calculation mode of the frequency array is as follows:
wherein f is2For frequency sweep cut-off frequency, f1For the frequency sweep starting frequency, N is the number of frequency sweep points, i is the frequency sweep number, and i is 0,1,2 … N-1.
further, preprocessing the two output signals to obtain two preprocessed output signals, including:
filtering the two paths of output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain two paths of filtered output signals;
and performing AD conversion on the filtered output signals to obtain two paths of digital output signals.
Further, the preprocessing the two output signals further includes:
the upper computer instruction comprises filtering control information;
determining whether to carry out band-pass filtering according to the filtering control information; and if the band-pass filtering is determined not to be carried out, replacing the two filtered output signals with the original two output signals.
Further, judging whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method;
the preset judgment method comprises the steps of comparing a signal peak value of a current acquisition output signal with a current range, and if the signal peak value is within a preset proportion range of the current range, the range adjustment is not needed; if the signal peak value is higher than the preset proportional range of the current range, the range is adjusted upwards according to a preset proportion; and if the signal peak value is lower than the preset proportional range of the current range, adjusting the range downwards according to a preset proportion.
further, the detection parameters comprise amplitude-frequency parameters and phase-frequency parameters;
the calculation formula of the amplitude-frequency parameter H is as follows:
H＝20lg(V2/V1)
the calculation formula of the phase frequency parameter C is as follows:
C＝θ2-θ1
wherein H is an amplitude-frequency parameter; v1Collecting a peak value of a waveform for a first channel; v2Collecting a peak value of a waveform for the second channel; c is a phase frequency parameter; theta1Collecting an initial phase of a waveform for a first channel; theta2And acquiring the initial phase of the waveform for the second channel.
Further, the detection parameters and the current frequency are stored in an associated manner;
judging whether the frequency sweeping process is finished or not according to the current frequency and the frequency sweeping cut-off frequency; when the frequency sweeping process is judged to be finished, the stored multiple groups of detection parameters are uploaded to an upper computer control unit;
generating a process instruction after each group of detection parameters are obtained through calculation; when the frequency sweeping process is not finished, the process instruction comprises a current frequency value; and when the frequency sweeping process is finished, the process instruction is a preset process instruction representing the end of frequency sweeping.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Reference to step numbers in this specification is only for distinguishing between steps and is not intended to limit the temporal or logical relationship between steps, which includes all possible scenarios unless the context clearly dictates otherwise.
Moreover, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.
Various component embodiments of the disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure may also be embodied as device or system programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present disclosure may be stored on a computer-readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware.
The foregoing is directed to embodiments of the present disclosure, and it is noted that numerous improvements, modifications, and variations may be made by those skilled in the art without departing from the spirit of the disclosure, and that such improvements, modifications, and variations are considered to be within the scope of the present disclosure.
Claims (16)
1. A transformer winding deformation frequency response method detection and operation system of wireless communication is characterized by comprising the following components:
an upper computer control unit and a lower computer detection unit; the upper computer control unit comprises an upper computer instruction module and an upper computer wireless communication module; the lower computer detection unit comprises a lower computer wireless communication module, a sweep frequency signal generation module, a signal processing module and a signal calculation module;
the upper computer instruction module is used for receiving control requirement information of a user and converting the control requirement information into a preset upper computer instruction; the upper computer instruction unit is connected with the upper computer wireless communication module; the upper computer instruction module sends the upper computer instruction to a lower computer detection unit through the upper computer wireless communication module; the upper computer instruction comprises frequency sweeping signal information;
the upper computer wireless communication module and the lower computer wireless communication module are used for establishing communication channels for data transmission through a preset wireless communication protocol;
the output end of the sweep frequency signal generating module is connected with the input end of the winding load of the transformer to be detected; the input end of the signal processing module is connected with the output end of the winding load of the transformer to be detected;
the frequency sweep signal generation module obtains frequency sweep signal information in an upper computer instruction through the lower computer wireless communication module, generates a frequency sweep signal according to the frequency sweep signal information and outputs the frequency sweep signal to the transformer winding load;
the signal processing module is provided with two input ends which are respectively connected with two output ends of the winding load of the transformer to be detected;
the signal processing module is used for preprocessing the two paths of output signals of the transformer winding load to be detected according to a preset rule and transmitting the two paths of output signals after preprocessing to the input end of the signal calculation module;
the signal calculation module is used for calculating to obtain detection parameters according to the two paths of input signals and a preset rule and uploading the detection parameters to the upper computer control unit through the lower computer wireless communication module;
and the upper computer control unit is used for analyzing the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result.
2. The system of claim 1, wherein: the sweep frequency signal information comprises sweep frequency signal information including signal peak value, sweep frequency starting frequency, sweep frequency cut-off frequency, sweep frequency mode and sweep frequency point number;
the signal peak value, the frequency sweep starting frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control requirement information determined by a user in a corresponding preset parameter interval.
3. The system of claim 2, wherein: the frequency sweeping modes comprise a linear frequency sweeping mode and a logarithmic frequency sweeping mode;
the upper computer instruction module is used for determining a frequency array according to the frequency sweep starting frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the frequency sweep point number;
the frequency sweep signal generation module sequentially generates frequency sweep signals according to the frequency values in the frequency array;
when the frequency sweeping mode is a linear frequency sweeping mode, the calculation mode of the frequency array is as follows:
when the frequency sweeping mode is a logarithmic frequency sweeping mode, the calculation mode of the frequency array is as follows:
wherein f is2For frequency sweep cut-off frequency, f1For the frequency sweep starting frequency, N is the number of frequency sweep points, i is the frequency sweep number, and i is 0,1,2 … N-1.
4. The system of claim 1, wherein: the signal processing module comprises a band-pass filtering submodule and an AD acquisition submodule;
the band-pass filtering submodule is used for filtering the two paths of output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain two paths of filtered output signals;
and the AD acquisition submodule is used for carrying out AD conversion on the filtered output signals to obtain two paths of digital output signals.
5. The system of claim 4, wherein:
the upper computer instruction comprises filtering control information; the band-pass filtering submodule is used for determining whether to carry out band-pass filtering according to the filtering control information; and if the band-pass filtering is determined not to be carried out, transmitting the two original output signals to an AD acquisition submodule.
6. The system of claim 4, wherein the signal processing module further comprises a range adjustment sub-module;
the range adjusting submodule is used for judging whether the acquisition range of the search output signal needs to be adjusted according to a preset judging method;
the preset judgment method comprises the steps of comparing a signal peak value of a current acquisition output signal with a current range, and if the signal peak value is within a preset proportion range of the current range, the range adjustment is not needed; if the signal peak value is higher than the preset proportional range of the current range, the range is adjusted upwards according to a preset proportion; and if the signal peak value is lower than the preset proportional range of the current range, adjusting the range downwards according to a preset proportion.
7. The system of claim 1, wherein: the signal calculation module calculates the detection parameters including amplitude-frequency parameters and phase-frequency parameters;
the calculation formula of the amplitude-frequency parameter H is as follows:
H＝20lg(V2/V1)
the calculation formula of the phase frequency parameter C is as follows:
C＝θ2-θ1
wherein H is an amplitude-frequency parameter; v1Collecting a peak value of a waveform for a first channel; v2Collecting a peak value of a waveform for the second channel; c is a phase frequency parameter; theta1Collecting an initial phase of a waveform for a first channel; theta2And acquiring the initial phase of the waveform for the second channel.
8. The system of claim 1, wherein: the lower computer detection unit also comprises a storage module and a process control module;
the storage module is used for performing associated storage on the detection parameters obtained by the calculation of the signal calculation module and the current frequency;
the process control module is used for judging whether the frequency sweeping process is finished or not according to the current frequency and the frequency sweeping cut-off frequency; when the frequency sweeping process is judged to be finished, uploading a plurality of groups of detection parameters stored in the storage module to an upper computer control unit;
the process control module is used for generating a process instruction after each group of detection parameters are obtained through calculation; when the frequency sweeping process is not finished, the process instruction comprises a current frequency value; when the frequency sweeping process is finished, the process instruction is a preset process instruction representing the end of frequency sweeping;
and the upper computer control unit receives a plurality of groups of inspection parameters after receiving a progress instruction representing the end of frequency sweeping.
9. A wireless communication transformer winding deformation frequency response method detection and operation method is characterized by comprising the following steps:
receiving control requirement information of a user and generating an upper computer instruction; the upper computer instruction comprises frequency sweeping signal information;
transmitting the upper computer instruction to a lower computer detection unit by a wireless communication method; generating a frequency sweeping signal according to the frequency sweeping signal information of the upper computer instruction and outputting the frequency sweeping signal to the transformer winding load;
collecting two paths of output signals of the transformer winding load to be detected, and preprocessing the two paths of output signals to obtain two paths of preprocessed output signals;
calculating according to the two preprocessed output signals and calculating according to a preset rule to obtain detection parameters;
uploading the detection parameters to an upper computer control unit through a wireless communication method; and analyzing the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result.
10. The method of claim 9, wherein: the sweep frequency signal information comprises sweep frequency signal information including signal peak value, sweep frequency starting frequency, sweep frequency cut-off frequency, sweep frequency mode and sweep frequency point number;
the signal peak value, the frequency sweep starting frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control requirement information determined by a user in a corresponding preset parameter interval.
11. The method of claim 10, wherein:
determining a frequency array according to the frequency sweep starting frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the frequency sweep point number; the frequency sweeping modes comprise a linear frequency sweeping mode and a logarithmic frequency sweeping mode;
generating frequency sweeping signals in sequence according to the frequency values in the frequency array;
when the frequency sweeping mode is a linear frequency sweeping mode, the calculation mode of the frequency array is as follows:
when the frequency sweeping mode is a logarithmic frequency sweeping mode, the calculation mode of the frequency array is as follows:
wherein，f2For frequency sweep cut-off frequency, f1For the frequency sweep starting frequency, N is the number of frequency sweep points, i is the frequency sweep number, and i is 0,1,2 … N-1.
12. The system of claim 9, wherein the pre-processing the two output signals to obtain two pre-processed output signals comprises:
the band-pass filtering submodule is used for filtering the two paths of output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain two paths of filtered output signals;
and the AD acquisition submodule is used for carrying out AD conversion on the filtered output signals to obtain two paths of digital output signals.
13. The method of claim 12, wherein pre-processing the two output signals further comprises:
the upper computer instruction comprises filtering control information;
determining whether to carry out band-pass filtering according to the filtering control information; and if the band-pass filtering is determined not to be carried out, replacing the two filtered output signals with the original two output signals.
14. The method of claim 12, wherein:
judging whether the acquisition range of the search output signal needs to be adjusted or not according to a preset judgment method;
the preset judgment method comprises the steps of comparing a signal peak value of a current acquisition output signal with a current range, and if the signal peak value is within a preset proportion range of the current range, the range adjustment is not needed; if the signal peak value is higher than the preset proportional range of the current range, the range is adjusted upwards according to a preset proportion; and if the signal peak value is lower than the preset proportional range of the current range, adjusting the range downwards according to a preset proportion.
15. The method of claim 9, wherein: the detection parameters comprise amplitude-frequency parameters and phase-frequency parameters;
the calculation formula of the amplitude-frequency parameter H is as follows:
H＝20lg(V2/V1)
the calculation formula of the phase frequency parameter C is as follows:
C＝θ2-θ1
wherein H is an amplitude-frequency parameter; v1Collecting a peak value of a waveform for a first channel; v2Collecting a peak value of a waveform for the second channel; c is a phase frequency parameter; theta1Collecting an initial phase of a waveform for a first channel; theta2And acquiring the initial phase of the waveform for the second channel.
16. The method of claim 9, wherein:
performing associated storage on the detection parameters obtained by the calculation of the signal calculation module and the current frequency;
judging whether the frequency sweeping process is finished or not according to the current frequency and the frequency sweeping cut-off frequency; when the frequency sweeping process is judged to be finished, uploading a plurality of groups of detection parameters stored in the storage module to an upper computer control unit;
generating a process instruction after each group of detection parameters are obtained through calculation; when the frequency sweeping process is not finished, the process instruction comprises a current frequency value; and when the frequency sweeping process is finished, the process instruction is a preset process instruction representing the end of frequency sweeping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010236222.9A CN111458662A (en) | 2020-03-30 | 2020-03-30 | Wireless communication transformer winding deformation frequency response method detection and operation system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010236222.9A CN111458662A (en) | 2020-03-30 | 2020-03-30 | Wireless communication transformer winding deformation frequency response method detection and operation system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111458662A true CN111458662A (en) | 2020-07-28 |
Family
ID=71676738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010236222.9A Pending CN111458662A (en) | 2020-03-30 | 2020-03-30 | Wireless communication transformer winding deformation frequency response method detection and operation system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111458662A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856343A (en) * | 2019-12-27 | 2020-10-30 | 广东电网有限责任公司电力科学研究院 | Transformer winding deformation analysis method, device, equipment and storage medium |
| CN114252805A (en) * | 2021-11-16 | 2022-03-29 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Wireless calibration equipment for transformer winding deformation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344566A (en) * | 2008-09-03 | 2009-01-14 | 中国电力科学研究院 | Test device and method for detecting winding deformation of power transformer |
| CN106443316A (en) * | 2016-10-12 | 2017-02-22 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding deformation state multi-information detection method and device |
| US20170356733A1 (en) * | 2016-09-02 | 2017-12-14 | Amirkabir University of Technology | Detection of radial deformations of transformers |
| CN214750765U (en) * | 2020-03-30 | 2021-11-16 | 中国电力科学研究院有限公司 | Wireless communication transformer winding deformation frequency response method detection and operation system |
-
2020
- 2020-03-30 CN CN202010236222.9A patent/CN111458662A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344566A (en) * | 2008-09-03 | 2009-01-14 | 中国电力科学研究院 | Test device and method for detecting winding deformation of power transformer |
| US20170356733A1 (en) * | 2016-09-02 | 2017-12-14 | Amirkabir University of Technology | Detection of radial deformations of transformers |
| CN106443316A (en) * | 2016-10-12 | 2017-02-22 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding deformation state multi-information detection method and device |
| CN214750765U (en) * | 2020-03-30 | 2021-11-16 | 中国电力科学研究院有限公司 | Wireless communication transformer winding deformation frequency response method detection and operation system |
Non-Patent Citations (1)
| Title |
|---|
| 韩丽娟;王宾宾;贾宇申;蔡振江;: "基于频率响应法的双CPU架构变压器绕组变形测试仪设计", 科学技术与工程, no. 09, 28 March 2013 (2013-03-28), pages 197 - 202 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856343A (en) * | 2019-12-27 | 2020-10-30 | 广东电网有限责任公司电力科学研究院 | Transformer winding deformation analysis method, device, equipment and storage medium |
| CN111856343B (en) * | 2019-12-27 | 2021-06-29 | 广东电网有限责任公司电力科学研究院 | Transformer winding deformation analysis method, device, equipment and storage medium |
| CN114252805A (en) * | 2021-11-16 | 2022-03-29 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Wireless calibration equipment for transformer winding deformation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102749539B (en) | Fast electromagnetic compatibility test and diagnosis system with quantization electromagnetic interference | |
| CN101701995B (en) | Impulse response analytical test apparatus and method for detecting deformation of transformer winding | |
| CN101907437A (en) | Wavelet difference algorithm-based cable fault localization method | |
| CN103135041A (en) | Transformer/ electric reactor partial discharge on-line monitoring method and transformer/ electric reactor partial discharge on-line monitoring system | |
| CN107390097A (en) | A kind of acoustoelectric combined shelf depreciation simulation detection system of GIS and its detection method | |
| CN111458662A (en) | Wireless communication transformer winding deformation frequency response method detection and operation system and method | |
| CN113395189B (en) | Vehicle-mounted Ethernet SQI signal quality testing method and system | |
| CN105911499A (en) | Ultrasonically local discharging metering system under onsite environment and method | |
| CN103744004A (en) | Transformer/reactor partial discharge online monitoring method and monitoring system | |
| CN103454526A (en) | Method for judging fault type of winding based on power transformer | |
| CN201083800Y (en) | Transformer substation insulated live-wire detector based on dummy instrument technology | |
| CN214750765U (en) | Wireless communication transformer winding deformation frequency response method detection and operation system | |
| CN106338653B (en) | Partial discharge typical interference simulation device | |
| CN117309874A (en) | Performance test method for twisted pair cable | |
| CN115825643A (en) | Cable defect positioning method, equipment and medium | |
| CN104407276A (en) | Signal acquisition device for laboratory partial discharge tests | |
| CN101762756B (en) | Laser pump-based online monitoring system for power equipment running state | |
| CN115032497A (en) | Cable defect detection system and method based on time-frequency domain reflection | |
| CN110926784B (en) | GIS circuit breaker fault on-line monitoring device based on sound | |
| CN107561475A (en) | High Frequency Current Sensor frequency band quantifies method of calibration, system and device | |
| CN107340442A (en) | A kind of power inverter common mode disturbances inhibition site assessment system and method | |
| CN106546904A (en) | The method and system of crosstalk signal between a kind of determination holding wire | |
| CN102495335B (en) | Sensitivity detection method of travelling wave distance measuring device and system thereof | |
| CN111398810A (en) | Slip ring electric spark detection and diagnosis system and detection and diagnosis method | |
| CN106597358A (en) | Traceability verification method for networked electric energy meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |